Making insoluble salts
4 marks · NormalThe insoluble salt lead(II) iodide can be made by a precipitation reaction involving lead(II) nitrate and potassium iodide.
Write a balanced chemical equation, with state symbols, for this reaction.
Write an ionic equation, with state symbols, for the formation of lead(II) iodide in this reaction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a)
(b)
Common mistakes: Missing state symbols; Incorrect balancing of equation
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Correct reactants and products shown.
A1 (a) · 1 mark · Equation correctly balanced and all correct state symbols.
M2 (b) · 1 mark · Correct ions included as reactants.
A2 (b) · 1 mark · Correct ratio of ions, correct product (PbI2), and all correct state symbols.
Worked solution
a) The balanced chemical equation is:
b) The ionic equation is: